Improved machine for cutting- alfd dressing stone



".PETBRS, PHOTO-LIITHOGRAPNH. WASHINGTON D C dinard tant Letters Patent No.u96,040, (lated October 19, 1869. y

IMPROVED MACHINE FOR CUTTING AND DRESSING STONE.

The Schedule 'referred' to in these Letten! Patent and making part of the same.

To all whom it may concern:

'Be it known that I, THOMAS SHARP, of Carlisle, in the county of `(,lumberland, and State of 1)ennsyl- Vania, have invented a new and useful Device for Cutting and Dressing Stone; and I do hereby declare the following to be a clear and exact description of the same, reference being had to the accompanying drawings, making part gf this specification,inwhichf- Figure 1 is a side elevation of the device constitut ing my invention.

Figure 2 is a central vertical longitudinal section thereof.

Figure 3 is an end view thereof.

Similar letters of reference indicate corresponding parts in the several figures.

My invention is a novel and useful device for cutting and dressing stone; and

It consists- First, in a series of chisels placed at an angle to the surface of the stone, struck in the direct line of the inclination. l

Second, in a sexies of chisels placed as the otherI series, but adapted to plane the stone.

Third, in means for operating the chisels.

The chisels are thus held and operated in a manner similar to that of manual labor, but the work and result are quicker, easier, and better than has been heretofore accomplished.

In the drawings- A represents a foundation or support for the workingparts of the device. Its upper side is moulded with railsor tracks, a, for guiding the motion of a. sliding carriage or truck, B, on which is placed the block of stone which is to he cut and dressed.

From the side of the .foundation p A, there arise standards, D, which form bearings for shafts, E E', which are mounted near the upper ends of said standaids.

On the upper shaft E there is keyed, or otherwise fastened, a rod or shaft, b, to whose lower end is secured a hammer, G, which should be suiiieiently wide -and heavy for a purpose hereinafter to be stated. This rod or shaft is the shank of the hammer, and has on its under side a notch which forms a shoulder, c.

On the other shaft E', I secure a tappet or cam, H, which is arranged on said sha-ft at a point in line with the shank or bar of the hammer.

Power is to be communicated to this shaft in any proper manner, and it is evident that when the shaft is rotated, the hammer G will receive Aa rising and -falling motion, owing to the tappet H being brought in contact with `the shank b.

So soon as the edge of the tappet clears the shoulder c, the :hammer falls, and the tappet continues its x rotation, and successively performs the operations, as

described.

J represents a head or stock, which is retained between the standards D by suitable guides orrests, K, which are secured to the standards by means of setscrews, d, or equivalent devices, and' are adjustable in a vertical plane, through the medium of slots e in the sides of the standards. This adj nstlnent is necessary according to the thickness of the stone to be cut.

The dimensions of this block J are such that it shall have a limited longitudial play on the rests K, but has no'lateral motion.

L is a series or gang of cutting-chisels applied to they head J, at such an inclination as to present an obtuse angle to tire face of the stone to be cut.

Suitable openings are made in the head J, to the chisels which are constructed properly for the purpose intended.

Their downward motion is limited by shoulders formed on their sides, and each chisel has a spring, j, bearing against its head, which springs are otherwise fastened to the block J It will now be'perceived thatthe hammer G is so hung, that when it falls, it will strike the top of the chisels L, and give a direct blow -to them. As the stone is advanced, the. chisels cut the face presented to'tbem, and then y upward away from the face. This. causes a recoil of the block J, which is arrested by a spring, g, which isproperly arranged, and secured for that purpose, and prevents heavy jars or shocks being communicated to the rests K and sta-ndards I). The chisels are then in position for another blow, and the operation of the above continues until.

the whole stone has its rough surface removed.

Meanwhile the stone passesbehind the chisels, and is then to be subjected to another gang or series of chisels, which dresses or finishes the. stone previously deprived of its rough surface.

M represents standards rising from the foundation A, and secured at an angle thereto. 4

Suitable slots, [gereformed in the standards, and through them pass set-screws, j which support guides or rests, N, placed 'at the Sides of the standards, and allow of the ready adjustment of the guides relative to the thickness of the stone which is to be dressed.

These guides support a head or block, O, having a certain longitudinal play, and provided with inclined slots in which are placed the dressing-chisels'l.

The latter are constructed similarly to the chisels L, and are presented to the stone at an obtuse angle, but have no springs applied to their heads as have the chisels L.

In the upper end of the standards M 4is mounted :a shaft, R, carrying an eccentric, S, of suitable dimensions, aud on which is placed a yoke, T, which is continued into a shaft, U, towhose lower end'is pivoted a. ram, VJ. This ram is constructed, by preference, of metal, in the form of a flat block, and of size. suiii ciently large to come in Contact with the entire gang of chisels simultaneously; and in consequence of its motion being in line with the 4inclination of the chisels, the latter are pushed in a direct line.

So soon as the pushing commences, motion is communicated to stock O, due to ram bearing against the head of the chisels.

The cutting-edges of the chisels then slideover the stone, and dress its surface in a manner similar to a plane.

The throw of the eccentric is such that the power of the ram is that of gradual and powerful push, and unlike the striking-motion of the hammer G.

The return-motion of the block O is caused by a spring, K, properly placed for that purpose.

' The movement-of the ram Vis guided by ways"or guides secured to the sides of thel standards M.

The-ram may be elevated and lowered by any other device than the eccentric-cranks. Talking-beams and equivalents will accomplish the same result.

A rope and tripping-mechanism may be employed to raise the hammer, and allow it to drop, but the result is the same as -with the tappet H.

The shafts E R may he extended to operate a series of hammers and rams. They derive their power from suitable pulleys and bands connected to the main driving-shaft of the engine, or otherwise.

The inclination at which the chiscls more against the .stone is similar to'that which they would occupy if heldin the human hand, and operated by hand-power.

The power of the hammer and ram may be regulated according to the quality or nature of the stone, while the depth ofthe cut is to be regulated by the location of the rests l which support the tool-stocks or heads I produce ,superior results by my invention, and accomplish the work of many hands in a simple and practical manner.

Having thus described my invention,

What I claim as new, and desire to secure `by Letters Patent, is-

1. A series of cutting-chisels L, arranged in a sliding stock J, in combination with a hammer which operates said ohisels simultaneously, substantially as described.

2. A series o planing-chisels P, arranged in a sliding stock O, in combination with a ram, V, which operates said chisels simultaneously, substantially as described.

3. The sliding stocks carrying the cutting-chisels, and operating as described.

4. The adjustable guides, supporting the sliding toolstocks, substantially as described.

To the above I have signed my name, this 7th day of'October, 1868.

THOMAS SHARP.

Witnesses:

WM. A. WIEDERSHEIM H. M. WIEDEBSHEIM. 

